#pragma GCC optimize(3)
#include <bits/stdc++.h>
using namespace std;
const int T = 1e8;

int main() {
//    ios::sync_with_stdio(false), cin.tie(nullptr);
    freopen("test.txt", "r", stdin);
    int time = 0;
    int s, e;

//    s = clock();
//    string str;
//    /********************************/
//    while (cin >> str) ;
//    /*********************************/
//    e = clock();
//    time = e - s;
//    cout << (double )time/CLOCKS_PER_SEC << "\n";

    s = clock();
    char str[100];
    /********************************/
    while (scanf("%s", str)!=EOF) ;
    /*********************************/
    e = clock();
    time = e - s;
    cout << (double )time/CLOCKS_PER_SEC << endl;
//
//    s = clock();
//    int a[10000];
//    /********************************/
//    for (int i = 0; i < 10000; ++i) {
//        memset(a, 0, sizeof a);
//    }
//    /*********************************/
//    e = clock();
//    time = e - s;
//    cout << (double )time/CLOCKS_PER_SEC << "\n";
    return 0;
}